}
-char *vAddSDPMedia (const char *type, int dport, const char *protocol,
+char *vAddSDPMedia (char **sdp,
+ const char *type, int dport, const char *protocol,
unsigned pt, const char *rtpmap,
const char *fmtpfmt, va_list ap)
{
- char *sdp_media = NULL;
+ char *newsdp, *ptr;
+ size_t inlen = strlen (*sdp), outlen = inlen;
/* Some default values */
if (type == NULL)
type = "video";
- if (dport == 0)
- dport = 9;
if (protocol == NULL)
protocol = "RTP/AVP";
assert (pt < 128u);
+ outlen += snprintf (NULL, 0,
+ "m=%s %u %s %d\r\n"
+ "b=RR:0\r\n",
+ type, dport, protocol, pt);
+
/* RTP payload type map */
- char sdp_rtpmap[rtpmap ? (sizeof ("a=rtpmap:123 *\r\n") + strlen (rtpmap)) : 1];
if (rtpmap != NULL)
- sprintf (sdp_rtpmap, "a=rtpmap:%u %s\r\n", pt, rtpmap);
- else
- *sdp_rtpmap = '\0';
+ outlen += snprintf (NULL, 0, "a=rtpmap:%u %s\r\n", pt, rtpmap);
/* Format parameters */
- char *fmtp = NULL;
- if ((fmtpfmt != NULL)
- && (vasprintf (&fmtp, fmtpfmt, ap) == -1))
- return NULL;
-
- char sdp_fmtp[fmtp ? (sizeof ("a=fmtp:123 *\r\n") + strlen (fmtp)) : 1];
- if (fmtp != NULL)
+ if (fmtpfmt != NULL)
{
- sprintf (sdp_fmtp, "a=fmtp:%u %s\r\n", pt, fmtp);
- free (fmtp);
+ outlen += sizeof ("a=fmtp:123 *\r\n");
+ outlen += vsnprintf (NULL, 0, fmtpfmt, ap);
}
- else
- *sdp_fmtp = '\0';
- if (asprintf (&sdp_media, "m=%s %u %s %d\r\n" "b=RR:0\r\n" "%s" "%s",
- type, dport, protocol, pt,
- sdp_rtpmap, sdp_fmtp) == -1)
+ newsdp = realloc (*sdp, outlen + 1);
+ if (newsdp == NULL)
return NULL;
- return sdp_media;
+ *sdp = newsdp;
+ ptr = newsdp + inlen;
+
+ /* RTP payload type map */
+ ptr += sprintf (ptr, "a=rtpmap:%u %s\r\n", pt, rtpmap);
+
+ /* Format parameters */
+ if (fmtpfmt != NULL)
+ {
+ ptr += sprintf (ptr, "a=fmtp:%u ", pt);
+ ptr += vsprintf (ptr, fmtpfmt, ap);
+ }
+
+ return newsdp;
}
-char *AddSDPMedia (const char *type, int dport, const char *protocol,
- unsigned pt, const char *rtpmap, const char *fmtpfmt, ...)
+char *AddSDPMedia (char **sdp, const char *type, int dport, const char *proto,
+ unsigned pt, const char *rtpmap, const char *fmtpfmt, ...)
{
va_list ap;
char *ret;
+
va_start (ap, fmtpfmt);
- ret = vAddSDPMedia (type, dport, protocol, pt, rtpmap, fmtpfmt, ap);
+ ret = vAddSDPMedia (sdp, type, dport, proto, pt, rtpmap, fmtpfmt, ap);
va_end (ap);
+
return ret;
}
const struct sockaddr *orig, socklen_t origlen,
const struct sockaddr *addr, socklen_t addrlen);
-char *vAddSDPMedia (const char *type, int dport, const char *protocol,
+char *vAddSDPMedia (char **sdp, const char *type, int dport, const char *prot,
unsigned pt, const char *rtpmap,
const char *fmtpfmt, va_list ap);
-char *AddSDPMedia (const char *type, int dport,
- const char *protocol, unsigned pt, const char *rtpmap,
- const char *fmtpfmt, ...);
+char *AddSDPMedia (char **sdp, const char *type, int dport, const char *proto,
+ unsigned pt, const char *rtpmap, const char *fmtpfmt, ...);
#endif